Chipping hammer



Oct. 28, 1947. I E. M. McMURTRY 8 CHIPPING HAMMER Filed Sept. 18, 1945 INVENTOR EUGENE M. MQMURTRY,

ATTORNEYS Patented Oct. 28, 1947 :ss or rice.

2,429,72&:

CHIPPING HAMMER? Eugene Mi 'MoMurtr-y Denver ;Gold; Application-September 18, 1945,4 Seri'a1Noi.61L051'1l Cf.1'25=--3&)

1 My: invention 7 relates. generally, to improvements in chippin hammers .andthelikfe tools, and .more particularly r to such a .t'ool having an improved sleeve in which the chexagonalior semi.-

circular. .cross section .bit orchisel worksvthe said sleeve being, capable of ifr'eely revolvingin the hammer. v casing or of. being ;vlockedjin any one of a. number of difierent rotarypositi'ons, whereby the same tool can be ,utilizedwfor. difficult itypes of. work; without the. operatorsl changing, the usual holding, position of the .toolptheprimary object-10f the invention being; to provide .an arrangement whereby the rfunctions .ofiitwo tools, the one having a stationary hexagonal. bore sleeve in which the hit cannot-turn and the other having a cylindrical bore sleeve .inwhi'clir thezbit is-ftreeto turn, are ma'de accessiblein :a single too 7 Other important objects and advantages of the invention will be apparent from a reading ofthe following description. and. the appended drawings showing a preferred embodiment of the invention for illustrationonly.--

In the drawings: Figure-I ls a general-sideelevationand-longitudinal sectional view taken through -a -chipping hammer :constructed accordingrto the'present invention.

Figure 2 is a. bottom plan 'viewr of the flanged sleeve-showing-thepositioning holes therein:

Figure 3 is a bottom plan view of the locking nut.

Figure 4 is a side elevation of the locking nut in inverted position.

Referring in detail to the drawings, the numeral 5 generally designates the chipping hammer casing or barrel having the cylindrical liner 6 adjacent to its lower end, conformably and rotatably receiving the sleeve 1 which has a noncircular bore 8, hexagonal in the illustrated form, to slidably and non-rotatably accommodate the chisel or bit 9.

The sleeve 1 terminates at its lower end in a circular flange 9 smaller in diameter than the interior of the barrel 5 below the liner 6, as shown in Figure 1, and provided at selected or equal circumferential intervals with positioning holes l0.

Holding the sleeve 1 in place in the lower end of the barrel 5 is the locking nut II which includes the exteriorly threaded cylindrical section 12 which threads into the lower end of the barrel 5 to hold the sleeve flange 9' against the lower end of the liner, and the wrench accommodating portion [3 on its lower side or end. A

smooth circular bore -isprovided in the-nut to freely-pass thechisel or bit 9.

Atonesidethe nut II has two bores l5and l6 arrangedsubstantiallyparallel to the axis of the nut and connected bya communicating recessyll, inwhich is pivoted at [8 a lever I'llwhich extends-'into'both -ofthebores I5 and I6 andis pivoted-thereinto the'detent pin 20- in thebore l5 and the push pin 2| in the bore l6. Thebore l 5- isfOrmedthrough-thetop=of the nut to persui'hcientlybelow -the nut'to enable it to-be pushed upwardly far enough to withdraw the-detent pin from: looking position when it is :desired that the chisel turn freely relative to the hammer barrel. Inthe; illustrated- -arrangement aspring detent 22 is provided inthe bore 1 6-to releasably engage a:- notch -23' in: the side of the-push: pin 2 l. to hold the latter in elevated position and .consequenth w the detent pinill in non-lockingpositionr Thebarrel 5;iliner fiy sleeve 1 and. tool 9:;fit one another with some degree of tightness, so that while permitting some adjustment by rotation, the parts will be held more or less tightly together against axial displacement, The tool 9 will be held in place against projection by the hammer upon striking the same by virtue of the tool being upon the work. The blows of the hammer will merely depress the same against the work. The movement of the hammer being limited at the most, the tool 9 would only be extended to a short distance out of range of the hammer.

I claim:

1. A chipping hammer or the like comprising a barrel including a liner adjacent to its outer end formed with a cylindrical bore, a sleeve having a cylindrical portion rotatably inserted in said cylindrical bore and having a flange to engage the outer end of said liner within said bore, said sleeve having a non-cylindrical bore, a reciprocable bit of a cross section non-rotatably and slidably fitting in the sleeve bore, an annular nut threaded on the outer end of said barrel through which the bit freely passes, said nut having a portion engaging the outer side of the sleeve flange to hold the flange against the outer end of the liner, said flange being formed with circumferentially distributed positioning apertures, and releasable detent means on said nut for lockably engaging any of said apertures to lock the sleeve in a selected rotary position relative to the barrel.

2. A chipping hammer or the like comprising a barrel including a liner adjacent to its outer end formed with a cylindrical bore, asleeve having a cylindrical portion rotatably inserted in -said cylindrical bore and having a flange to engage the outer end of said liner within said bore, said sleeve having a non-cylindrical bore, a reciprocable bit of a cross section non-rotatably and slidably fitting in the sleeve bore, an annular nut threaded on the outer end of said barrel through which the bit freel passes, said nut having a portion engaging the outer side of the sleeve flange to hold the flange against the outer end of the liner, said flange being formed with circumferentially distributed positioning apertures, and releasable detent means on said nut for lockably engaging any of said apertures to lock the sleeve in a selected rotary position relative to the barrel, and means on said nut for releasably holding said detent means in non-locking position permitting the sleeve and the bit to rotate freely relative to the barrel.

3. In a chipping hammer the like of the type having a barrel including a liner formed with a cylindrical bore, a sleeve rotatable in said liner bore and provided with a non-cylindrical bore for non-rotatably accommodating a reciprocating non-cylindrical bit, and an annular nut threaded on the end of the barrel and freely-passing the bit, said nut having a portion entering the .4 sleeve having a non-cylindrical bore, a reciprocable bit of a cross section non-rotatably and slidably fitting in the sleeve bore, an annular nut threaded on the outer end of said barrel through which the bit freely passes, said nut having a portion engaging the outer side of the sleeve flange to hold the flange against the outer end of the liner, said flange being formed with circumferentially distributed positioning apertures, and releasable detent: means onsaid nut for, lockably engaging-any of said apertures to'lockthe sleeve in a selected rotary position relative to the barrel, said detent means comprising a detent pin end of the barrel and engaging a portion on said. 7

sleeve to position the sleeve in the liner, and releasable detent means on the nut for lockably engaging said portion of the sleeve enabling locking the sleeve and thereby the bit in a selected,

position of rotation relative to the barrel and confining the bit to reciprocation in such'position. r

4. A chipping hammer or the like comprising a barrel including a liner adjacent to its outer end formed with a'cylindrical bore, a sleeve having a cylindrical portion rotatably inserted in said cylindrical bore and having a flange to engage the outer end of said liner within said bore, said movable into and out of locking position, a push pin, and a pivoted element operatively connecting the detent pin and the push pin.

5. A chipping hammer or the like comprising a barrel including a liner adjacent to its outer end formed with a cylindrical bore, a sleeve having a cylindrical portion rotatably inserted in said cylindrical bore and having a flange to engage the outer end of said liner within said bore, said sleeve having a non-cylindrical bore, a reciprocable bit of a cross section non-rotatably and slidably fitting in the sleeve bore, an annular nut threaded on the outer end of said barrel through which the bit freely passes, said nut having a portion engaging the outer side of the sleeve flange to hold the flange against the outer end of the liner, said flange being formed'with circumferentially distributed positioning apertures, releasable detent means on said nut for lockably engaging any of said apertures to lock the sleeve in a selected rotary position relative to the barrel, said detent means comprising a detent pin movable into and out of locking position, a push pin, a pivoted element operatively connecting the detent pinvand the push pin, and a releasable spring detent engageable with the push pin to releasably hold the 1push pin and the detent pin in non-locking posi- EUGENE M. MCMURTRY.

REFERENCES CITED UNITED STATES PATENTS 7 Name Date Murphy Oct. 17, 1905 Number 802,303 

